Calan has its side effects. The most common are:
Less common but more serious side effects during taking Calan:
allergy reactions (urticaria, breathing difficulties, rash, and eruption)
fast or slow heartbeats
fever, sore throat, and headache with a severe blistering, peeling, and red skin rash
feeling short of breath, even with mild exertion
rapid weight gain
loss of appetite
Side effects manifestations are not only depend on medicine you are taking but also depend on your health state and on the other factors.
Do not take Calan if you are allergic to Calan components.
Be careful with Calan if you're pregnant or you plan to have a baby, or you are a nursing mother.
Do not take Calan if you have poor heart condition, low blood pressure, recent heart attack.
Be careful with Calan if you suffer from kidney, liver disease, congestive heart failure, muscular dystrophy.
Be careful with Calan if you take medications such as any other blood pressure medications; buspirone (BuSpar); carbamazepine (Carbatrol, Tegretol); cimetidine (Tagamet, Tagamet HB); cyclosporine (Gengraf, Neoral, Sandimmune); digoxin (digitalis, Lanoxin, Lanoxicaps); lithium (Eskalith, LithoBid); lovastatin (Mevacor); phenobarbital (Solfoton); rifampin (Rifadin, Rimactane, Rifater); theophylline (Elixophyllin, Theo-24, Uniphyl); a sedative such as midazolam (Versed) or triazolam (Halcion); an antibiotic such as clarithromycin (Biaxin), erythromycin (E-Mycin, E.E.S., Ery-Tab, Erythrocin), fluconazole (Diflucan), itraconazole (Sporanox), ketoconazole (Nizoral), telithromycin (Ketek), or voriconazole (Vfend); a beta-blocker such as atenolol (Tenormin), bisoprolol (Zebeta, Ziac), metoprolol (Lopressor, Toprol), propranolol (Inderal, InnoPran), sotalol (Betapace), timolol (Blocadren), and others; a heart rhythm medication such as amiodarone (Cordarone, Pacerone), disopyramide (Norpace), flecainide (Tambocor), or quinidine (Quinaglute, Quinidex, Quin-Release); HIV/AIDS medicine such as amprenavir (Agenerase), atazanavir (Reyataz), delavirdine (Rescriptor), fosamprenavir (Lexiva), indinavir (Crixivan), nelfinavir (Viracept), or ritonavir (Norvir, Kaletra).
Do not use potassium supplements or salt substitutes.
Avoid eating grapefruit or drinking grapefruit juice while taking Calan.
If you want to achieve most effective results without any side effects it is better to avoid alcohol.
Be very careful when you are driving machine.
Do not stop taking Calan suddenly.